A Hypothetical "Larger than full-frame": Lens Question

This input is very helpful. I own a lot of good Canon lenses, and the possibility of being able to use them with a new high res camera has been very appealing. Right now I am doing most of my photography with the Sigma SD1-M, whose resolution I find significantly better than that of my 5D3. Which is to say I've fallen in love with high resolution photography. But the SD1-M's deficiencies (especially slow write speeds and no live view) have been a negative. Thus, I've been very interested in the possibility of a high res Canon DSLR.

But if such a camera means getting a new suite of Canon lenses, that changes the equation a lot. It sure would be helpful if Canon would give us a clearer idea of where they plan to go.